Paper container and the like.



W. L. WRIGHT.

PAPER CONTAINER AND THE LIKE.

APPLICATION FILED NOV-1,1916.

Patented Aug. 7, 1917.

- WILIBUR L. WRIGHT, or BALTIMORE, MAR'YLAND.

PAPER CONTAINER AND THE LIKE.

Specification of Letters Patent.

Patented Aug. 7, 1917.

Application filed November 1, 1916. Serial No. 128,979.

To all 'wlwm z't mag camera:

Be it known that I, WILBUR L. WRIGHT, a citizen of the United States, and resident of Baltimore, State of Maryland, have invented certain new and useful Improvements in and Relating to Paper Containers and the like, of which the following is a specification.

This invention relates to certain improvements in paper containers and the like, and the objects and nature of the invention will be readily understood by those skilled in the art in the light of the following explanation of the accompanying drawings illustrating what Inow believe to be the preferred mechanical expression or embodiment of my invention from among other forms Within the spirit and scope thereof.

The end closure of the paper container of my invention is characterized by an inner sealing disk, originally of greater diameter than the interior of the container body, and having its annular edge portion bodily deflected or bent from the normal plane of the disk into approximately tapered or conical form, with its peripheral edge tightly engaging and bearing outwardly against the ,inner surface of the body but without circumferentially distorting or. bulging the 'body, and this container of my invention is {further characterized by a flanged outer disk supporting said inner sealin disk and having its annular edge portion where the body of the disk joins its flange) tightly pressed against and approximately conforming to the shape of the annular tapered or conical portion of theiiiner sealing disk and also to'the inner surface of the body below the inner sealing disk to form a liquid tight seal and a crimp looking together the end of the container body and the flange of the outer disk and pressing them upwardly to support said distorted lnclined portions of the disks.

It is an object of the invention to provide paper containers with liquid tightend cloparticularly set forth and specified hereinafter.

Referring to the accompanying drawmgs:

Figure 1, shows a paper container constructed in accordance with my invention, the lower portion of the container being shown in longitudinal section and the remainder thereof in elevation.

Fig. 2, is an enlarged sectional view of a portion of the lower end of the container.

Figs. 3 and 4, are sectional views of a modification.

Fig. 5, is a sectional view showing a slightly modified form of the formation of Figs. 1 and 2.

The container comprises a paper material body or approximately cylindrical wall 1, the bottom or end closure of which is formed by a paper material imperforate inner sealing disk 2, and a paper material outer flanged disk 3 with the end ofthe body and the flange 4 of the flanged disk crimped and compressed together and up against the bottom surface of disk 3 to form a crimp 5 locking and supporting the disk in the lower end of the body.

That part of the outer annular edge portion of the disk that is located above crimp 5 is bodily'deflected from the general plane of the body of the, disk to form flared, inclined tapered or conical portion 6 with its circumferential or peripheral edge sprung into tight engagement with the inner surface of the body and held in unbroken engagement therewith by the natural spring or elasticity of the paper of the disk when thus held bent and under constant tension. The deflection of the edge portion of the disk is not extensive enough to materially affect the internal capacity of the container.

In Figs. 1, 2 and 5, the annular edge portion 6 of the disk 2, is bent or inclined upwardly and hence by its tight unbroken tension engagement with the wall 1 tends to hold the sealing disk down to the flanged disk and resists the tendency of the sealing disk to move toward the open end of the body under the influence. of the suction'created by sudden removal of the usually snugly fitting slip cover 7 from the open end of the container. I

-The annular corner 8 of the flanged or outer disk, at the junction between the body of the disk and the flange, is forced or compressed upwardly into the V angle between the surrounding wall of the body and the flared edge portion 6, ofdisk 2 to tightly fit the under surface of the portion 6, and said wall, and to uphold and support said portion.

The flange 4 is usually upset and compressed upwardly by the crimping operation which bends and folds the body wall 1 to inclose said flange and if so desired presses the end 9 of the body wall into the under inner'angle between the flange 4 and the body portion of the disk.

If so desired, "said end 9 can be 'so forced into said inner under angle of the disk body and its flange as to form a locking groove 10 receiving said end 9, andeso holding the same as to form a lock for the crimp.

In Figs. 3 and 4, the inner sealing disk 2 is formed with a downwardly bent flaring, tapered or inclined annular edge portion 6, with its annular edge held under tension in tight engagement with the inner surface of the surrounding wall 1. This flaring depending portion 6? is supported by the annular portion 8 ofthe flanged disk which forms the junction between the flange and body of said disk. The portion 8 is compressed against the under side of the flare fl and conforms to the shape thereof and tends to pinch and lock said portion 6 against the inner surface of the wall 1 and thereby hold the inner sealing disk against upward movement. The wall 1 faces the inner and outer surfaces of the flange 4 and incloses the lower edge thereof and is compressed upwardly therewith to upset the flange and lock the flange and wall together into a permanent crimp while the upper end 9 of the portion of wall 1 in the crimp is preferably compressed against the under side of the inclined or flared portion 8 of the flanged disk to stiffen and support the same in pinching and holding the flare 6 of disk 2 against the inner surface of wall. 1.

In the formation of both Figs. 1 and 3,

the annular outer edge portion of the flanged disk conforms to and is tightly pressed against the flare of the inner sealing disk to form a liquid tight seal or bottom closure for the paper can or container and to uphold and support the inner sealing disk at its annular edge portion rather than at its central portion which need not even contact the body portion of the flanged disk.

I gain important advantages by flaring the edge portions of the enlarged diameter inner sealing disks, as such flaring edges which do not distort the walls of the container, will conform to irregularities and inequalities in the thickness and curvature of the container walls and tightly fit the same and form tight continuous seals between the edges of the disks and the inner surfaces of the walls, in conjunction with the conforming flanged disks, and reduce the percentage of defective or leaky sealed bottoms to a minimum. I

The various disks and cylindrical body of a can or container are preferably paraffined and dried before being assembled to form the complete paper can.

My method of assembling and completing the can consists in placing the cylindrical body on a comparatively snugly fitting mandrel with the bottom end of the body projecting upwardly a distance above the upper end of the mandrel. The inner sealing disk 2 of enlarged diameter with respect to the interior of the body and in a flat condition, is then inserted at an inclination into said projecting body end and pressed down approximately to a horizontal position on the mandrel end. The flanged outer disk is then inserted in the body end and pressed down on the sealing disk. To form the seal as shown in Figs. 1, 2 and 5, the surrounding annular edge portion of the otherwise flat top end of the mandrel is beveled off to conform to the flared end 6 of the sealing disk. A suitable crimping head is then brought into operative position with respect to the mandrel end and the disks and projecting body and the necessary pressure is applied to form the crimp, hereinbefore described, and to bend and compress the edge portions of the disks upwardly against the beveled ofl' edge of the mandrel and to thereby form the flare 6 and drive the flanged disk upwardly against flare 6 to form projecting annular angle 8 and at the same time to longitudinally compress and upset the flange 4 within the inclosing end of the wall 1 and to tightly draw the wallso that the exterior of the lower'end of the can body will be slightly tapered or contracted as indicated at 12.

To produce the downward flare 8 and corresponding formations of Figs. 3 and 4, the mandrel is formed with an elevated annular V lip around its edge portion so that the longitudinal pressure of the mandrel and crimping head toward each other during the crimping operation, will deform or distort the sealing and flanged disks to produce the desired seal formation.

It is evident that various modifications and variations in formation and structure and in the method of forming and assembling can be resorted to without departing from the spirit and scope of my invention and hence I do not wish to limit myself to the exact disclosures hereof.

What I claim is 1. A paper container having a cylindrical wall and a flanged end disk, the end of the container wall being doubled. over the flange of the disk to form a crimp, and an inner sealing disk having its annular edge portion bodily bent in one direction from the plane of the disk to form an elastic flare maintained under tension against and tightly fitting the inner surface of the container Wall, the annular edge portion of the flanged disk being distorted in the same directlon as said flare and pressed against said flare and supporting the inner disk, substantially as described.

2. A paper container having an approximately cylindrical wall and an end closure consisting of an inner sealing disk having its anular edge portion flaring in one direction from the general plane of the disk and thus held under compression .in tight sealing engagement with the inner surface of said wall,

a flanged outer disk held pressed againstv and supporting said inner disk, and a lock crimp between the end of the wall and the flange of the disk and maintaining the annular edge portion of the flanged disk compressed to said flare of the inner disk, substantially as described.

3. A paper container having an approximately cylindrical wall and an end closure consisting of an inner sealing disk the annular edge portion of which is bodily deflected to form a flare the peripheral edge of which is pressed into sealing engagement with the inner surface of the wall, and a flanged outer disk pressed to and supporting the inner disk and approximately conforming to the edge flare thereof, the end of the Wall and the flange of the disk being compressed together to form a crimp, substantially as described.

4:. A paper container having an ap roximately cylindrical wall and an end 0 osure consisting of an inner sealing disk the annular edge portion of which is bodily deflected to form a flare tightly fitting the surrounding inner surface of the wall, and a flanged outer disk compressed against and approximately conforming to said flare, the end of the wall embracing theflange of said disk and compressed to form a crimp, the

extremity of said wall being compressed against the under side of the portion of said flanged disk that conforms to and supports said flare.

5. A paper container having an approximately cylindrical wall, and a closure within an end of said wall and consisting of an inner sealing disk having its edge in ti ht frictional engagement with the inner sur ace of the wall and an outer flanged disk within said wall and supporting said inner disk, the end of said wall embracing the flange of said outer disk and in connection therewith forming a locking crimp, said locking crimp holding thelower end of said wall radially contracted tightly against the edges of said two disks, the annular edge portions of said two disks being bodily distorted together in the same direction longitudinally of the container and from their general planes and held in intimate engagement with each other and the inner surface of saidwall to form a liquid tight end closure, substantially as described.

6. A paper container having an end closure within its longitudinal wall and consisting of an outer flanged disk, the depending flange of which is arranged within and embraced by the depending portion of said wall, said wall and flange forming a locking crimp against said disk, and an inner sealing disk tightly fitting and upheld by said flanged disk, the peripheral edge of said disk having tight engagement with the inner surface of said wall and thereby holding said disk against upward movement from said flanged disk, said inner disk having its annular edge portion bent longitudinally of the container and from the general plane of the disk to maintain the disk under tension in forcing its edge into tight holdingengagement with said wall and to prevent bulging of said wall,

the annular edge portion of said flanged disk being distorted in the same direction as and tightly against said bent annular edge of the inner disk, substantially as described;

WILBUR L. RIGHT. 

